Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e5089b860dd8769…

MALICIOUS

PDF

53.5 KB Created: 2020-08-29 11:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9da2bfebeb4fee3d786fe7e5117dd54d SHA-1: c5f4cf1e896bd7ff3d4eef5505eb77057fde194a SHA-256: 0e5089b860dd876904918f5d14ae3d93a0071bdd51e299a8d67324edd9f2f298
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=absolute+beginner%2527+s+guide+to+c'. Additionally, it features a PDF link farm with numerous external links, many of which are benign Shopify URLs, but the primary redirector is flagged as malicious. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=absolute+beginner%2527+s+guide+to+c
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0154/3830/files/weekly_planner_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/unbreakable_kimmy_schmidt_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0437/9446/4929/files/55472781540.pdf
    • https://static.usrfiles.com/ugd/b8c837_8643840dc7034cd780770d12740eeb49.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d59396c198f4cf39d4cf8d6817daf74.pdf
    • https://static.usrfiles.com/ugd/b8c837_beae7e68c9d34032ac0c56de8b4b6aed.pdf
    • https://static.usrfiles.com/ugd/b8c837_986247ee4390497b8bc33b25eace979e.pdf
    • https://static.usrfiles.com/ugd/b8c837_bad4b69883224d7d8273a374c929be27.pdf
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/alpha_kappa_alpha_membership_intake_process_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3992/files/activities_for_esl_students.pdf
    • https://static.usrfiles.com/ugd/b8c837_acae9f8603aa45ad8ee2cd57f7623b9f.pdf
    • https://static.usrfiles.com/ugd/4ae4db_e684d8b1093647399722de5f439ad6ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_58416f673d194866acf20d68800139f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_74c8d5b9a8ef47ab906091a9d2d4077e.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008900.bin
bd42011e44750f9ba7be94f97a837a8fd4a9474ae1ee629f1e0591a1580eae96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8900 4940 bytes
font_01_sfnt_off000099ce.bin
fb1a336be80102d856b150ce1460abf62d489ca02d4d8ce7f9af35f530ca1ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99CE 9648 bytes
font_02_sfnt_off0000bacd.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBACD 4324 bytes

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